Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

45901 results found.

  1. GRB 050315: Swift-BAT further refined analysis
  2. GRB 050315, SMARTS optical/IR afterglow observations
  3. GRB 050315 I-band observations
  4. GRB050315: Radio afterglow
  5. GRB 050315: Absorption redshift
  6. GRB 050315: Optical afterglow identification
  7. GRB050315: Swift-BAT Refined analysis
  8. Non-detection of GRB050315 in ATCA Radio Observations
  9. GRB 050315: Swift XRT Position
  10. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  11. GRB 050315: Early Observations with Swift/UVOT
  12. Swift-BAT detection of GRB 050315
  13. GRB050223: No XMM-Newton OM detection of afterglow emission
  14. GRB 050306: Radio Observations
  15. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  16. GRB050309: CONCAM pre-trigger and trigger coincident optical
  17. GRB 050306: optical afterglow
  18. GRB 050126: Redshift determination
  19. Swift-BAT trigger 107873: No Swift XRT counterpart
  20. GRB 050306: Confirmation of X-ray afterglow
  21. GRB 050309, Early optical limits from RAPTOR
  22. GRB 050306: further TAROT optical data
  23. GRB050309: Early optical limit from P60
  24. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  25. GRB 050309 : Lulin R-band observation
  26. Swift 107873: P60 Optical Observations
  27. GRB 050306: CORRECTION to date of observation
  28. GRB 050306: R-band observations
  29. GRB 050306: No Swift UVOT Optical Counterpart Detected
  30. GRB 050306: REM optical-infrared observations
  31. GRB 050306: Possible X-ray Afterglow Position from the Swift
  32. Swift trigger 107518: optical observation
  33. GRB 050306: TAROT optical observations
  34. GRB 050306,optical observation
  35. GRB 050306: Swift-BAT detection of a long burst
  36. Ongoing activity of SGR 1806-20 after the giant flare
  37. GRB050215B: Late-Time Swift UVOT Observations
  38. GRB 050126: Confirmation of the NIR afterglow candidate
  39. PROMPT VRcIc Observations of GRB 050223
  40. XRF/GRB 050215B: Radio Observations
  41. XMM-Newton Images of GRB 050223
  42. GRB 050219b: candidate NIR afterglow
  43. IBAS GRB Alert #2321
  44. Confirmed XRF nature for GRB050215b
  45. GRB 050223: optical observations
  46. GRB050223 XMM-Newton observation
  47. INTEGRAL detection of GRB 050223
  48. GRB 050223 : Planned XMM-Newton observation
  49. GRB050223: No Swift UVOT Detection of Afterglow Emission
  50. GRB050223: ROTSE-III Optical Observations
  51. GRB 050223 Swift/BAT detection of a burst
  52. GRB 050223: Swift XRT Position
  53. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  54. GRB050219b: CORRECTION to time of UVOT observations
  55. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  56. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  57. GRB 050219b: CORRECTION to refined XRT position
  58. GRB 050219a: Optical observations from LCO
  59. GRB 050219b: Optical and near-IR observations from LCO
  60. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  61. GRB 050219b: Refined XRT position
  62. GRB 050219b: Swift-BAT detection of a burst
  63. GRB 050219b: CORRECTION: Swift XRT Position
  64. GRB 050219b: Swift XRT Position
  65. GRB 050219a, optical observations
  66. GRB 050219a: Refined XRT position
  67. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  68. GRB 050219: Swift-BAT detection of a burst
  69. GRB050215b: Swift UVOT Detection of Afterglow Emission
  70. GRB 050219: Prompt X-ray position
  71. GRB 050215B: Radio Observations
  72. GRB 050215b: XRT confirmation of IR afterglow candidate
  73. GRB050215b: P60 Optical Observations
  74. GRB 050215b: Swift XRT Source Variability
  75. GRB 050215B: candidate afterglow
  76. GRB 050215b : Lulin follow-up observation
  77. GRB 050215b, BOOTES-2 simultaneous optical observations
  78. GRB 050215B: UKIRT K-band imaging
  79. GRB 050215b: Swift XRT Observations
  80. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  81. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  82. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  83. GRB 050215b, BOOTES-1B optical limit
  84. GRB050215B: ROTSE-III optical observations
  85. GRB050215A: ROTSE-III Optical Observations
  86. GRB050209: TAROT optical observations
  87. GRB 050209(=U11568): Duration and spectrum
  88. short/hard GRB 050202, optical observations
  89. GRB050209: REM optical observations
  90. GRB 050209 I-band observation
  91. GRB 050209 Optical observations
  92. GRB050209: P60 Optical Observations
  93. GRB050209 (=U11568): A Long GRB Detected by HETE
  94. GRB 050209: Optical observation
  95. GRB 050128: Radio observations
  96. Further analysis of the short Swift-BAT GRB 050202
  97. GRB 050202: Second epoch radio observations
  98. GRB 050129: Optical observations
  99. GRB050202: Radio Observations
  100. GRB 050202: Optical observations with LCO40

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov